
<?php
echo "<table border='1'>";

        for($i=0;$i<10;$i++) {
            if($i%2==0){
                echo"<tr bgcolor='red'>";
            }else{
                echo"<tr>";
            }

            for($j=0;$j<10;$j++){
                echo"<td>".($i*10+$j)."</td>";
            }
            echo "</tr>";
        }
echo "</table>";
echo"";


?>


<?php
$shu = 'biao';
$biao = 'wo';
$wo = 'test';
$test = 'sina';
$sina = 'zhongguo';
$zhongguo = 'china';
$china = '我爱你';
//别运行，自己去推理一下代码。也写几个可变变量玩玩吧！
echo $$$$$shu;
?>
